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Newborn Screening Ontario
Spinal Muscular Atrophy

SMA Screening Results

Most babies who are screened for SMA will have a negative result.   A screen negative result means that a baby has a low risk of having the disease and follow-up diagnostic testing is not needed based on these results.

A small number of babies will have a screen positive result for SMA.   It is expected that approximately 15 babies will have a screen positive newborn screening result for SMA each year in Ontario.  A screen positive result for SMA means there is a high risk for SMA.  Infants with a screen positive results will be referred for follow up.